/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.explorer.ui.alfresco;

import com.vaadin.data.Item;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.runtime.ProcessInstanceQuery;
import org.activiti.explorer.data.AbstractLazyLoadingQuery;

import java.util.ArrayList;
import java.util.List;


/**
 * @author Joram Barrez
 */
public class ProcessInstanceTableLazyQuery extends AbstractLazyLoadingQuery {

    protected transient RuntimeService runtimeService;
    protected String processDefinitionId;

    public ProcessInstanceTableLazyQuery() {
        this.runtimeService = ProcessEngines.getDefaultProcessEngine().getRuntimeService();
    }

    public ProcessInstanceTableLazyQuery(String processDefinitionId) {
        this();
        this.processDefinitionId = processDefinitionId;
    }

    public int size() {
        return (int) constructQuery().count();
    }

    public Item loadSingleResult(String id) {
        return new AlfrescoProcessInstanceTableItem(constructQuery().processInstanceId(id).singleResult());
    }

    public List<Item> loadItems(int start, int count) {
        List<ProcessInstance> processInstances = constructQuery().listPage(start, count);
        List<Item> items = new ArrayList<Item>(processInstances.size());
        for (ProcessInstance processInstance : processInstances) {
            items.add(new AlfrescoProcessInstanceTableItem(processInstance));
        }
        return items;
    }

    public void setSorting(Object[] propertyIds, boolean[] ascending) {
        throw new UnsupportedOperationException();
    }

    protected ProcessInstanceQuery constructQuery() {
        ProcessInstanceQuery query = runtimeService.createProcessInstanceQuery()
                .orderByProcessInstanceId().asc();
        if (processDefinitionId != null) {
            query.processDefinitionId(processDefinitionId);
        }
        return query;
    }

    public void setProcessDefintionId(String processDefinitionId) {
        this.processDefinitionId = processDefinitionId;
    }

}
